Each pack is a collection of hundreds of sheep you can download and manually install into the Electric Sheep (version 2.7) with the instructions at community.electricsheep.org/node/247.
The Electric Sheep is a cyborg mind. It harnesses the collective intelligence of 60,000 computers and people creates abstract art with mathematics and Darwinian evolution. The result is seamless, organic, and infinite. See see electricsheep.org and scottdraves.com.